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Note 7 - Marketable Securities - Short-term and Long-term Available for Sale Securities (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Amortized Cost	$ 49,186
Unrealized Gains	203
Unrealized Losses	(37)
Fair Value	49,352
Bank Time Deposits [Member]
Amortized Cost	5,395
Unrealized Gains	73
Unrealized Losses	0
Fair Value	5,468
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	19,281
Unrealized Gains	51
Unrealized Losses	(5)
Fair Value	19,327
Corporate Debt Securities [Member]
Amortized Cost	20,010
Unrealized Gains	78
Unrealized Losses	(30)
Fair Value	20,058
US Government Agencies Debt Securities [Member]
Amortized Cost	3,500
Unrealized Gains	1
Unrealized Losses	(2)
Fair Value	3,499
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	1,000
Unrealized Gains	0
Unrealized Losses	0
Fair Value	$ 1,000

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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